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Abstract

We propose and investigate a simply self-restored tree-type time-division-multiplexed passive optical network (TDM-PON) with duplex fiber system against the fiber failure. The new proposed optical line terminal (OLT), optical network unit (ONU), and remote node (RN) can be used to prevent and protect the occurrence of fiber failure in the self-protected tree-type PON. The protection and restoration time of the access network can be archived within 7 ms in this experiment. In addition, the performances of data traffic for the fiber access network are also analyzed and discussed.

BER performances of (a) downstream and (b) upstream traffic at 1.25 Gb/s modulation through the working and restoring fiber paths between OLT and ONUi without and with protection no matter the fiber fault occurs on the feeder or distributed fibers, respectively.